I never use any thread sealant on SBC head bolts...
the holes in the block are blind in a lot of locations and a heavy application of sealant can cause a hydraulic lock and prevent the bolt from achieving full torque load...
Worse case I have seen them crack blocks !
Run a tap down each bolt hole in the block to clean out any debris and then use a little anti seize smear on the bolt threads...
I would be checking that bolt hole next to where the gasket blew for cracks...or pulled threads...
I would also not install the Dexcool on the rebuild until you are totally sure the blown head gasket issue is corrected...just fill it with normal tap water and run it for a few days.
